Pulsed Magnets - SR Kicker Current Waveform 6 s 2.5kA 4 kicker - - PowerPoint PPT Presentation

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Pulsed Magnets - SR Kicker Current Waveform 6 s 2.5kA 4 kicker - - PowerPoint PPT Presentation

Mar 06, 2023 165 likes •273 views

Top-up Operation at the Swiss Light Source Pulsed Magnets - SR Kicker Current Waveform 6 s 2.5kA 4 kicker pulses SPring-8 12/03/02 Michael B oge 21 Top-up Operation at the Swiss Light Source Pulsed Magnets - SR Kicker

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SLIDE 1

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02

Pulsed Magnets - SR Kicker Current Waveform

µs 6 pulses 4 kicker 2.5kA

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SLIDE 2

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02

Pulsed Magnets - SR Kicker Field Measurements

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SLIDE 3

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02

Digital Power Supplies - Overview

Short/Long Term: 1/30 ppm One Digital Control Unit for ~600 power supplies of the SLS

Short/Long-Term: <10/30 ppm

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SLIDE 4

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02

Digital Power Supplies - 1 MVA Bending Booster

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SLIDE 5

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02

Timing System - Structure

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SLIDE 6

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02 Timing System - Basic Logic for Top-up

  • Inject every Nth cycle when the current is below a defined threshold

– Gun trigger, SR injection kickers trigger enabled when a top-up cycle occurs – Possibly switch off booster cycle (not tried yet) – Warn beamlines, send a gate event to disable DAQ. – Need to synchronize several IOCs

  • Synchronously count cycles to determine when to trigger
  • Cycle data preset through channel access, synchronized with an event

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SLIDE 7

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02 Digital BPM System - Overview

Closed Orbit: Mode for All Machines in Different Operation Only One BPM System Turn−by−Turn: Vital for Commissioning 4 KSample/s, <1.2 mu m 1 MSample/s, <20 mu m Turn−by−Turn: Closed Orbit Mode −> Fast GlobalOrbit Feedback PSI +

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SLIDE 8

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02 Top-up Operation - Current Stabilization

  • LTB:ICT2=0.58 nC
  • LTB:ICT3=0.35 nC (60 %)
  • BS:MPCT=0.1 mA
  • SR:PCT=300-301 mA
  • SR:τ=10 h
  • SR:dPCT=0.3 mA/sec
  • SR:dt=3.5 sec (1 mA)

301 mA 300 mA 1 mA 10 h 2 min @ 10 h ICT2=0.58 nC ICT1=0.62 nC ICT3=0.35 nC 0.3 mA/sec ~20 mA/min Lifetime 3.5 sec = 0.60 * ICT2 10 min Current Injection Rate

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SLIDE 9

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02

Top-up Operation - Long Term Current Stabilization

  • 2 days run @ 250 mA with a deadband of 1 mA in October
  • τ=12 h @ I=250 mA (I×τ=3 Ah)
  • time between injections dt=3 min (≈960 injections in 48 h)

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SLIDE 10

“Top-up” Operation at the Swiss Light Source

SPring-8 12/03/02 Top-up Operation - Bunch Pattern

Standard Mode:

  • I=300 mA
  • 45+390+45=480 buckets
  • Is=0.77 mA ±0.1 mA
  • I Variation ±13 %
  • φ=15 deg over train

buckets 45 buckets 45

0.77 mA +0.1mA −0.1mA

Bucket #389 Bucket #0

Phase 15 deg +13% −13% Current

780 nsec

390 x 0.77=300 mA

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